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vm_page_alloc (9)
  • >> vm_page_alloc (9) ( FreeBSD man: Ядро )

  • BSD mandoc
     

    NAME

    
    
    vm_page_alloc
    
     - allocate a page for a
    
    Vt vm_object
    
     
    

    SYNOPSIS

       #include <sys/param.h>
       #include <vm/vm.h>
       #include <vm/vm_page.h>
    vm_page_t vm_page_alloc (vm_object_t object vm_pindex_t pindex int page_req);
     

    DESCRIPTION

    The vm_page_alloc ();
    function allocates a page at Fa pindex within Fa object . It is assumed that a page has not already been allocated at Fa pindex . The page returned is inserted into the object, but is not inserted into the pmap.

    vm_page_alloc ();
    will not block.

    Its arguments are:

    Fa object
    The VM object to allocate the page for.
    Fa pindex
    The index into the object at which the page should be inserted.
    Fa page_req
    A flag indicating how the page should be allocated.

    VM_ALLOC_NORMAL
    The page should be allocated with no special treatment.
    VM_ALLOC_SYSTEM
    The page can be allocated if the cache queue is empty and the free page count is above the interrupt reserved water mark. If VM_ALLOC_INTERRUPT is set, the page can be allocated as long as the free page count is greater than zero. This flag should be used only when the system really needs the page.
    VM_ALLOC_INTERRUPT
    vm_page_alloc ();
    is being called during an interrupt and therefore the cache cannot be accessed. The page will only be returned successfully if the free count is greater than zero.
    VM_ALLOC_ZERO
    Indicate a preference for a pre-zeroed page. There is no guarantee that the page thus returned will be zeroed, but it will be marked as such.
    VM_ALLOC_NOOBJ
    The page is associated with an unmanaged memory region, that is, there is no backing VM object. This is typically used to allocate pages within the kernel virtual address space.

     

    RETURN VALUES

    The Vt vm_page_t that was allocated is returned if successful; otherwise, NULL is returned.  

    NOTES

    The pager process is always upgraded to VM_ALLOC_SYSTEM unless VM_ALLOC_INTERRUPT is set.  

    AUTHORS

    This manual page was written by An Chad David Aq [email protected] .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    NOTES
    AUTHORS


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